Table 2.

CT parameters of each group

Body part	Dose group	Tube voltage (kV)	Tube current (mA)	Collimation (mm)	Pitch	Rotation time (s)	Thickness (mm)	Scan length (cm)
Shoulder	Standard	120	200	64 × 0.625	0.609	0.5	2	32
Low	120	100	64 × 0.625	0.609	0.5	2	32
Pelvis	Standard	120	200	64 × 0.625	0.609	0.5	2	32
Low	120	100	64 × 0.625	0.609	0.5	2	32
Ankle	Standard	120	150	64 × 0.625	0.391	0.5	2	32
Low	120	75	64 × 0.625	0.391	0.5	2	32
Wrist	Standard	120	150	64 × 0.625	0.391	0.5	2	16
Low	120	75	64 × 0.625	0.391	0.5	2	16